Monthly Archives: May 2016

Earn up to 5 hours of recertification credits – commercial pesticide applicator, HPC, ISA arborist or SAF!

Here is a great opportunity to receive training hours in commercial credits that are hard to come by. Willie Chance is now retired from Extension and is helping coordinate trainings for pest professionals to maintain credit hours.

Pest Manager TLC

Do you need Pesticide Applicator, Structural HPC, ISA arborist or Society of American Forester credits?  

Do not miss this opportunity to earn recertification credits!

USDA Forestry Service, Bugwood.org 2
Source: USDA Forestry Service, Bugwood.org

Pest Manager Training

Friday May 27 in Valdosta, GA

Find Valdosta agenda here!

Register online now!

Earn up to five hours of credits!  

~~~ 5 hours of Georgia Commercial Pesticide Credit – Any Category! ~~~

Category 24, Ornamentals & Turf        Category 27, Right of Way  

Category 41, Mosquito Control           Category 23, Forestry

Also Categories 21, 22, 25, 26, 31, 32, 35, 36, 37, or 38!

~~~ 2 hours HPC Structural Credits ~~~

~~~ Up to 5 hours of ISA credits (details on agenda) ~~~

~~~ Also 5 hours of Society of American Forester CFEs (Category 1) ~~~

Pre-registration price until Thursday, May 19. Only $59!

After May 19 – $65.

Register online now!

For more information you can call (478) 972-9981…

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Downy Mildew In Georgia

SpaghettiSquash 008

This morning we looked a Spaghetti Squash in the southern part of the county that is showing symptoms of downy mildew. We were able to get back to the office and confirm both downy and powdery mildew. We usually see powdery on the upper side of the leaf and downy on the lower side. With downy, the yellowing will stay within the veins, and powdery will cross over the veins.

Upper leaf

Upper leaf

Underside of leaf

Underside of leaf

Dissecting microscope - PM (left) DM (right)

Microscope – PM (left) DM (right)

Here is some information from UGA Extension Pathologist Dr. Bhabesh Dutta:

These observations indicate that inoculum of downy mildew is currently in GA and under favorable conditions (cool and wet conditions) potential disease outbreak in cucurbit can occur. I would suggest our cucurbit growers to look for the downy mildew symptoms in their fields and start applying protective spray of below stated fungicides.

Watermelon: Rotation (foliar application)  with Orondis+Bravo/Manzate; 

                                                                                               Ranman+Bravo/Manzate; 

                                                                                               Previcur flex+Bravo/manzate

Please do not use bravo after fruit set

Other cucurbits: Ranman+Bravo; Previcur flex+Bravo

If Orondis was used as a soil application, please do not use it as foliar (use restriction according to label).

If Orondis was not used as a soil application, foliar application can be done for controlling downy mildew.

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Metribuzin On Soybeans

Here is some information from UGA Extension Weed Scientist Dr. Eric Prostko:

As many of you know, I have been trying my best to prevent the oversue of Valor and Reflex in soybeans, especially for growers who also plant cotton and peanuts. Growers who want to protect Valor and Reflex (PPO’s) have many other PRE options including Dual, Warrant, and metribuzin. For you Roundup babies out there, let me remind you of a few things about metribuzin.

  1. Metribuzin used to be sold under the trade names of Sencor (Bayer) or Lexone (DuPont).  Many moons ago, about 20% of the US soybean crop was treated with metribuzin.
  2. Current trade names for metribuzin include the following: Tricor, Metribuzin, Dimetric.
  3. Metribuzin is also a component of many soybean pre-mixes including the following: Authority MTZ (metribuzin + Spartan), Boundary (metribuzin + Dual Magnum), Canopy or Canopy Blend (metribuzin + Classic) ), Intimidator (metribuzin + Reflex + Dual Magnum), and Trivence (metribuzin + Valor + Classic).
  4. When using metribuzin in soybeans, soil type, OM and pH are very important.  Metribuzin should not be used on coarse soils (i.e. sandy loam or loamy sand) with less than 1% OM and/or in soils with a pH greater than 7.5.  Refer to the individual product labels for more specific information about use rates, soil types, and organic matter restrictions.
  5. Metribuzin is in the same herbicide family as atrazine (triazine). Metribuzin is a PS II inhibitor (WSSA Group 5).
  6. Metribuzin injury symptoms on soybeans are presented below:
Metribuzin Injury on Soybean - Dr. Eric Prostko

Metribuzin Injury on Soybean – Dr. Eric Prostko

Metribuzin Injury on Soybean - Dr. Eric Prostko

Metribuzin Injury on Soybean – Dr. Eric Prostko

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Spiderwort In Pastures & Hay Fields

Spiderwort (3)

We are seeing spiderwort in pastures now. I was asked if I knew what this weed was last week. It was actually growing along the roadside where we first looked. It is in both pastures and hay fields. Spiderwort emerges in early spring, flowers in March-April, and then produces seed through mid-summer. It is an issue in grazing forage because cows avoid it. In the situations we looked at, the large, fleshy stem makes spiderwort an issue in hay production. When cut with a grass forage, spiderwort does not dry at the same rate as the grass and can cause spoilage when the hay is baled.

Spiderwort

Spiderwort

Control

Here are some control options from Dr. Jay Ferrell, University of Florida Weed Scientist found in their blog post: Spiderwort: A Troublesome Weed Invading North Florida Hays & Pasture Fields.

Experiments were conducted in High Springs, Florida to compare the activity of commonly used pasture herbicides on fully emerged and flowering spiderwort.  All herbicides were applied with crop oil concentrate (COC) at 1% v/v.

Spiderwort response to all herbicides was similar at 1 week after treatment (WAT) and control was less than 50% (Table 1). Triclopyr resulted in 86% control while very little change was noted from all other herbicides at 4 WAT.  Triclopyr exhibited excellent control (95%) at 8 WAT, while the other treatments remained at 50% or less.  Control of spiderwort by triclopyr began to decline shortly after 8 WAT (data not shown), and spiderwort re-established in all plots.

SpiderwortControl-UF

Conclusion

No single herbicide application was found to fully control spiderwort.  The greatest control was found when triclopyr was applied at 32 fl oz/acre. Canopy growth did not recommence in the triclopyr plots for another 4 to 6 weeks after the initial burn-down.  However, the majority of the spiderwort plants did eventually regrow in the triclopyr plots. Therefore, it is important to keep in mind that the results from triclopyr may be temporary. With this timeline in mind, producers should treat infested fields at least a month prior to cutting hay.  Fortunately, producers should have at least a month after burn-down to cut and bale their hay without experiencing any issues associated with spiderwort. It will take multiple cycles of regrowth and burn down to reduce the population in a field.  When feasible, hand removal is still the most effective control method.

 

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Filed under Pasture, Weed Science